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New Phytol. 2019 Apr 29. doi: 10.1111/nph.15872. [Epub ahead of print]

Mechanistic understanding of photorespiration paves the way to a new green revolution.

Author information

1
Institute of Plant Biochemistry, Cluster of Excellence on Plant Science (CEPLAS), Heinrich Heine University, Universitätsstrasse 1, Düsseldorf, 40225, Germany.

Abstract

Photorespiration is frequently considered a wasteful and inefficient process. However, mutant analysis demonstrated that photorespiration is essential for recycling of 2-phosphoglycolate in C3 and C4 land plants, in algae, and even in cyanobacteria operating carboxysome-based carbon (C) concentrating mechanisms. Photorespiration links photosynthetic C assimilation with other metabolic processes, such as nitrogen and sulfur assimilation, as well as C1 metabolism, and it may contribute to balancing the redox poise between chloroplasts, peroxisomes, mitochondria and cytoplasm. The high degree of metabolic interdependencies and the pleiotropic phenotypes of photorespiratory mutants impedes the distinction between core and accessory functions. Newly developed synthetic bypasses of photorespiration, beyond holding potential for significant yield increases in C3 crops, will enable us to differentiate between essential and accessory functions of photorespiration.

KEYWORDS:

C1 metabolism; CO2 assimilation; RubisCO; crop yield; metabolic interdependency; oxygenation; photosynthetic efficiency; synthetic bypass

PMID:
31032928
DOI:
10.1111/nph.15872

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